Calcasieu Parish was created March 24, 1840, from the parish of Saint Landry, one of the original nineteen civil parishes established by the Louisiana Legislature in 1807 after the United States acquired the territory in the Louisiana Purchase of 1803.[3] The original parish seat was Comasaque Bluff, a settlement east of the river and later called Marsh Bayou Bluff. On December 8, 1840, it was renamed as Marion, Louisiana.

In 1852 Jacob Ryan, a local planter and businessman, donated land and offered to move the courthouse in order to have the parish seat moved to Lake Charles. As the population in this area grew over the years, the original Calcasieu Parish has since been divided into five smaller parishes. The original area of Calcasieu Parish is called Imperial Calcasieu.

The name Calcasieu[p] comes from the Atakapa word, spelled quelqueshue in a French transliteration, and meaning "crying eagle." This was the name of an Atakapa chief, which French colonists applied to the local river, the Calcasieu River. When the Spanish controlled this area, they referred to this river as the Rio Hondo (Rio Stondo or "Deep River"). The Americans adopted an English transliteration of the French name for the parish.

There is some speculation that Calcasieu is simply an anglicized spelling of "quelque chose" (pronounced cal-ka-showz) which is french for "something". They potentially named it Something Parish after Something River.[citation needed] There much hesitation to accept an apathetic origin to the name however, it is within believability when you consider the capital of the state was named after a literal stick in the mud, Baton Rouge.[citation needed]

The early history of the parish dates to the period of the Spanish occupation of Louisiana, after France had ceded this territory following its defeat by Great Britain in the Seven Years' War. In 1797, Jose M. Mora was granted a large tract of land between the Rio Hondo (now Calcasieu River) and the Sabine River, known for years as the "Neutral Strip" between Louisiana and Texas. The area became a refuge for outlaws and filibusters from Carolina, Georgia, and Mississippi of the United States, which had recently gained independence from Great Britain.

The territory was disputed for years between Spain and the United States after France had ceded Louisiana to the American government as part of the Louisiana Purchase of 1803. It was definitively acquired by the United States from Spain with the Adams-Onis Treaty in 1819. The treaty was formally ratified on February 22, 1821. By an act of Congress, approved on March 3, 1823, this strip of land was attached to the district of the Louisiana Territory south of the Red River.

Early settlers to the area included the Ryan, Perkin, LeBleu, Deviers, and Henderson families. Acadian settlers, from the eastern parishes of Louisiana, also migrated to this area. Of French descent and exiled by the British from Acadia (eastern Canada), many of these refugees had settled in Louisiana. The parish had a diverse ethnic mix of French and Spanish Creoles, Acadians, Anglo-Americans, enslaved African Americans, and Indians.

Calcasieu Parish was created in 1840 from the Parish of Saint Landry. The new parish was the largest in the state, larger than either of the two smallest states, Delaware and Rhode Island.[3] This size, which ultimately was divided into five parishes, led to the parish's nickname "Imperial Calcasieu."[3]

On August 24, 1840, six men met at a private home near present-day Chloe to organize as the parish police jury representing six wards. The first order of business was to elect officers, appoint a parish clerk, and settle on simple parliamentary rules that would enable the president to keep the meetings orderly and progressive. The jury adopted all of the laws then in force in Saint Landry Parish. They appointed a parish constable, a parish treasurer, two parish assessors, and an operator of the ferry at Buchanan's crossing. The assessors were given two months to assess all of the property in the parish and a salary of $90.

On September 14, 1840, a survey was authorized of land known then as Marsh Bayou Bluff in order to establish a seat of justice (parish seat) and construct a courthouse and jail. On December 8, 1840 the jury chose to rename this community as Marion. In 1843, the Legislature authorized a vote to move the parish seat.

Finally in 1852, Jacob Ryan was successful in having the parish seat relocated from Marion to the east bank of Lake Charles. This parish seat was incorporated in 1857 as the town of Charleston; it was reincorporated in 1868 as Lake Charles. It is located about six miles (10 km) from Marion, now known as Old Town. The name Lake Charles commemorates one of the first European settlers, Charles Sallier, a Frenchman who acquired land in this area at the beginning of the 19th century.[4]

But the area set aside for Cameron Parish had a majority-white population. In the late 1870s, white Democrats regained control of the state legislature through fraud and intimidation. At the turn of the century, they disenfranchised most blacks in the state by creating barriers to voter registration, then passed racial segregation and other Jim Crow laws.

In 1912 Calcasieu Parish still comprised an area of more than 3,600 square miles (9,300 km2), and remained the largest parish in the state by geographic area. In 1912, "Imperial Calcasieu" was further divided with the creation of the three new parishes of Allen, Beauregard, and Jefferson Davis, with a total area of approximately 2,548 square miles (6,600 km2).[3][4] These were the most recent parishes organized in Louisiana. Following these jurisdictional changes, Calcasieu Parish lost almost half of its population between the 1910 and 1920 United States Census.

Calcasieu Parish is governed by an elected body known as the Police Jury. Some 15 single-member districts have been defined, with a population of approximately 12,200 persons per district (based on the 2000 Census). Each district elects one Juror for representation, in keeping with the ruling by the U.S. Supreme Court of the "one man, one vote" principle.

The Court had found that Louisiana and a number of other states had failed to reapportion their state legislatures for decades, in many cases keeping representation based on geographic boundaries, such as counties or parishes, rather than population. This had resulted in under-representation for decades of urban and industrialized districts in the state legislature. Redistricting was also required at the parish level for election of police juries. By the constitution, reapportionment (or redistricting) of the parish is required following each official census. This can change the boundaries of the single-member districts, to ensure that each Juror represents approximately the same number of people.

A 2003 report found that the office of the public defender in Calcasieu Parish used an expert in only 1 of 171 cases. The criminal defense lawyers in that parish visited their clients in jail in only 1 out of 14 cases.[5]

The first courthouse erected at Marion, a crudely built log cabin, was completed in August 1841. When the seat of justice was changed to Lake Charles in 1852, Sheriff Jacob Ryan with the help of his slave, Uncle George, and the aid of his good friend and fellow landowner, Samuel Adams Kirby, loaded the log cabin courthouse on an ox cart and transported the small building through the piney woods to Lake Charles. A new wooden courthouse was completed within a year.

This courthouse was replaced in 1891 by a colonial-style brick building erected at a cost of $20,000. In 1902 the parish added an annex to this building. A disastrous fire on April 23, 1910, destroyed the courthouse as well as most of downtown Lake Charles. Many of the records of the parish were burned or damaged. On April 4, 1911, the Police Jury decided to build a new courthouse on the old site.

It is a brick and terracotta structure completed in 1912 at a cost of $200,000. It is a replica of the famous Villa Copra, known as the Rotunda in Vicenza. The villa was designed by noted Italian architect, Andrea Palladio. His work became internationally known in the 17th and 18th centuries, and was influential both in Great Britain and the United States. Calcasieu Parish's replica was designed by Favrot and Livaudais of New Orleans. The dome atop the courthouse is of solid copper.

An annex containing two additional court rooms and additional space for the Clerk of Court and the Police Jury was added in the year 1958. Another annex for the Third Circuit Court of Appeals of the State of Louisiana was completed in 1960.

In 1967, a Parish Government Building was completed to house the various offices of the Police Jury. This building was expanded in 2003, and houses the following departments: Office of the Parish Administrator, Records Department, Division of Finance/Purchasing, Facilities Management, Human Resources Department, Division of Planning and Development, Division of Engineering and Public Works, and the Government Access Channel.

In 1987, a new building was constructed to house the District Attorney's Office. A new state-of-the-art correctional center was completed in 1990 to replace the old jail, which was constructed in 1956. A separate building was completed in 1991 for the Third Circuit Court of Appeals. A Judicial Center was constructed on the site of the old jail to house the Fourteenth Judicial District, and was completed in March 1994.

Between 1993 and 1998 an extensive interior and exterior restoration and renovation was performed on the 1912 Parish Courthouse. The Courthouse houses several offices, including the Clerk of Court, Juvenile and Family Court, Registrar of Voters, Sheriff's Civil Division, Veterans Affairs Office, and others.

There were 73,996 households out of which 35.60% had children under the age of 18 living with them, 52.60% were married couples living together, 14.70% had a female householder with no husband present, and 28.50% were non-families. 24.00% of all households were made up of individuals and 8.90% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.11.

In the parish the population was spread out with 27.40% under the age of 18, 10.30% from 18 to 24, 28.70% from 25 to 44, 21.80% from 45 to 64, and 11.90% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 94.80 males. For every 100 females age 18 and over, there were 91.30 males.

The median income for a household in the parish was $35,372, and the median income for a family was $41,903. Males had a median income of $36,569 versus $21,390 for females. The per capita income for the parish was $17,710. About 12.80% of families and 15.40% of the population were below the poverty line, including 19.90% of those under age 18 and 14.20% of those age 65 or over.

Elements of the 256th IBCT and the 139TH RSG (Regional Support Group) are based in Lake Charles. The 256th IBCT deployed to Iraq twice, 2004-5 and 2010. De Quincy is the home of H Company of the 199th Forward Support Battalion which is a detachment of 3-156th Infantry Battalion. The Battalion's HHC is located in Lake Charles. These units deployed to Iraq with the 256TH IBCT.

A. B. Franklin (born 1948), an African-American businessman and Democratic politician from Lake Charles who has served as a member of the Louisiana House of Representatives for Calcasieu Parish since 2008.[16]

Gilbert Franklin Hennigan (1883-1960), served in the Louisiana Senate from Allen, Beauregard, Calcasieu, Cameron, and Jeff Davis parishes from 1944 to 1956. He was born in Meadows in Calcasieu Parish and also lived in Beauregard Parish.

Robert G. "Bob" Jones (born 1939), a Lake Charles stockbroker, served in both houses of the Louisiana legislature between 1968 and 1976. He later switched to the Republican Party after running unsuccessfully in the 1975 gubernatorial primary.

Wilbert Rideau (born 1943), was a winner of the George Polk Award as editor of The Angolite, the Louisiana State Penitentiary's prisoner-produced newsmagazine. Rideau had been convicted of murder and sentenced to death in 1961 by an all-male, all-white jury in a trial called "kangaroo court proceedings" by the United States Supreme Court, which threw out the conviction based on pre-trial publicity. He was tried and convicted again; appeals resulted in two more trials. He was self-taught. At a fourth trial in 2005, Rideau was unanimously convicted of manslaughter and sentenced to 21 years. As he had already served more than 40 years, he was released immediately. He continues to work as a writer and journalist.